Aiming at some possible up-and-down situations from 2015 to 2017,this paper revealed the ground deformation distribution characteristics and change rules in Kunming city with 34 descending images from Sentinel-1,by means of PS-InSAR and some GIS techniques.Meanwhile,in terms of geology,hydrology and human factors,the causes and influence factors of subsidence were summarized and analyzed.It showed that there was an extensive deformation in Kunming city,whose average velocity among±10 mm/a.Besides the north of Dianchi Lake,taking Yuhu,Guangwei and Hongjia as centers,3 subsidence zones with big areas and rapid subsidence rates had been discovered.Puji in northwest and Zongshuying around west ring road are two new discoveries in this paper.